Penny Ice Cap

The 333.78m. P95 core was drilled to the bed in April-May 1995.
The 89m. P95.2 core was drilled adjacent to the P95 core (2.5 m. away)
for evaluation of noise in the record. The d18O correlation between
the two cores is .80.

The 177.91m. P96 core also reached the bed. It is located
approximately 16 km. from P95. The P95-P96 correlation of d18O
on 40-year segments is .3 to .5.

The P95 core was dated back to 7900 yr ago (319 m) by spectral analysis of the
electrical conductivity record which tracks seasonal chemical variations
(Fisher et al. 1998; Grumet et al., 1998. Additional time control was provided by
conductivity and sulfate peaks related major volcanic eruptions.
Beyond 7900 yr ago, the depth-age curve was adjusted to match the end of the
Younger Dryas-Holocene transition (326 m) dated at 11,550 +/- 70 yr ago in
Greenland ice-core records. Age values for the P95 microparticle record are
expressed in years before A.D. 2000 (yb2k).